Sparking plug for explosion-engines.



I I. 0.0RSWELL. SPARKING PLUGTOR EXPLOSION ENGINES APPLICATION mm; M125, 1906.

witne ses: [R a -5 7 WW-HM. a 0

ISRAEL (1. ORSWELL, OF 'AMESB URY, MASSACHUSETTS, ASSIGNOR TO ORSWELL IGNITER COMPANY, OF BOSTON, "MASSACHUSETTS, A

CORPORATION OF MAINE.

s No. 841,566.

Specification of Letters Patent.

SPAFIKI'NG PLUG- FOR EXPLOSION-ENGINES- PatntdJan. 15, 1907'.v

Application filed January 25, 1906. Serial No, 297,791-

' To all whom it may concern:

- Be it known that I, ISRAEL 0. ORSWELL, a

I citizen of the United States, residing at Ames bury, in the county of'EsseX and State of Massachusetts, have invented an Improve- -ment in' Sparking Plugs for Explosion-Engines, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

My invention relates to sparking devices 'for explosion-engines, and particularly to the construction of spark-plugs and inductioncoils therefor.

My invention will be best understood by reference to the following description, when taken in connection with the accompanying illustration, of one specific embodimentthereof, while its scope will be more particularly pointed out ip t e appended claims.

In the drawings, Figure 1 is an elevation of a spark-plug embod g one form ofmy invention, and Fig. 2 s ows in central vertical section the plug illustrated in Fig. 1.

Referring to the drawings and to,the specific embodiment of my invention therein illustrated, I have shown a spark-plug for an ex- 1 3 v which is in series with the sparking electrodes.

In the illustrated embodiment of my invenplosion-engine provided with sparking terminals or electrodes combined in a single structure withan induction-coil, the secondary of tion the coil comprises a suitably-pr0portioned' primarywinding a, which is wound upon the core I), the latter preferabl consisting of a bundle of soft-iron wires wit suitable insulating material interposed between the coil and core. Outside of the coil a and'with the interposition of a layer of insulating material c is wound the secondary coil d, which,

as usual, is of relatively fine wire. The coil thus-constructed is-incased within a coveri.

c e of suitable insulating material'andplace within'acylindrical metallic casing f, which latter is lined .with a thickremovable sleeve 9,

of mica or other hard waterproof insulating substance; v

v The partially open end of the cylindrical 4 casing at its rear end (upper end in Figs. 1 5

and 2) isclosed by the mica or other insulatingwasher h and the pair of washers i and j, of like material, the latter being held between H the end of the mica sleeve and the overturned walls of the casing end. Outside-of the cashold the sleeves firmly in position.

ing is the base-block of insulating materialo, upon which is mounted the apertured terminal lugs p 1), provided with suitable set screws, to which the battery-leads may be readily connected. These lugs are 'held in position byscrews threaded from the interior of the casing and countersunk in the mica disk 'L.

The lugs are suitably drilled toreceive the primary coil leads g g, which are maintained in firm conducting contact with the lugs by means of tapered wedges '1' r, driven in fromthe outside, which wedges act also to close up the drilledhole against the The threaded end of the head is provided with longitudinally-tapered passages, into which are fitted the tapered sleevesug v, of mica orother suitable insulatingmaterial, the

outer ends of these sleeves projecting beyond the threaded end of the head and the inner ends of the' sleeves entering suitably-formed recesses in the forwardly-projecting portion of the porcelain insulating-plate.

Into the open ends of thernica sleeves are driven tapered plu s w and w, of brass or other suitable con ucting material, which Into the ends of these plugs are fixed,respectively, the sparking electro other suitable material, the electrode as consisting of a substantially straight piece of wire and the electrode w of a similar piece, but bent-or inclined toward the electrodes herein with a substantially right-angled bend.

The plug 10 and its sleeve '0 are longer, re-

spectively, than the plug w and the sleeve 1;,

es w and x, of platinum or i 'the leadl-wires. The'sparkingtelectrodes-are mounted upon= thesame structure with the: secondary coil: andad-irectly connected there-- 'yond the other, however, and by abruptly turning themne terminal toward the other, the likelihood of bridging the electrodesdrom' the, described cause is greatly reduced. 5 The construction of the porcelain plate and the ta cred mica sleeves, provides highly-in? sulate assages orconduits'for the secondary lea -'w ires y y,

firmly secured by the tapered wedges drivenimfiomitherouten ends of the plugsa construction of plug; described prol vides aeompact but strcngianddurable-and wholly- .waterprcof casing: .for' the coilsand teeby heavily-insulated leads, thus avoiding: the wasteful effectoil a grounded secondary on lengthy secondary leznl-wires, this i'e ature in-praotice,.as L havefound, ermittingthe I useot a'coilofextremely sma lproportions,.

while obtaining aisparlt of.- the: desired inten- The lug and coil-described are'adapted as house with an eXteriorly-arranged and independent vibrator and vibrator-magnet lts constructionpermitsthe application of a number oi'these-coils to'the severalcylindersof a multiple-cylinder en ine while using a single exteriorlvibrator an 'vibraton magnet,

the coil-primaries being connected-in multiple with eachbther and in series with acommon circuit containing the battery and the vibrator-ma et. Thls arrangement associates the in uction-coils 'in close proximity with: the sparking. terminals, avoiding the use of exposed, secondary lead-Wires, whilehaving: the practical advantage of a single vibrator for the several: coils." The compact construction ofacombined spark-coil and plug permits its addition to the engine-cylinder,while occupying but little more room then; the ordinary sparkplug;

While for'illustrativc-purposesl have here shown and described one form of my invention, it is to be understood that the same isnot limited: to -th'e details and form: and ar rangement of parts, but that these maybe varied wide'li'mits without departing 6 5 from the spirit of the invention.

which pass directly through the porcelain plate, the mica sleeves andthe plugs vw and w, to-whioh they are- I: have; found that thesenses 1' claim- 4 1.. A v sparln-plugl carrying sparking, electrodes and having a. non-magnetic metallic casing containing an inductionecoil,v to the secondary of which said electrodes are connected, said casinghav-ingits walls cut away at separat'edint'ervals lengthwise the axis of the coil.

A sparh plug havin insulated sparking electrodes projecting cm the inner end of the plug, the insulation of one electrode being carried beyond the insulation: oi the other; e

3;. A: sparlie-plug having insulatedl sparking electrodes, one: of said electrndes being: 8: inclined or bent toward the other; the inane lationi of: said electrode being carried apvproximately'tothe-paint ofzbend'thereint. v

4'. A; sparkeplug: having a casing. a coil! within' said: casingpinsulated. sparking elec- 5 trodes, to which the secondary: winding-oh said coil is connected, an. insulating pl'ate; at the end ofisaidcoil havingaaniouter. raiiaedrre cessedfportioni and: insulating+sleeves enten ing the recesses in said raised POIt'lOHlthEOU?! whichthe secondary lead-wires pass: to: t e sparking electrodes.

51 AL spark-plug having a' casing, and. at coiliwithinz saidicasing, said plug beingpmavi ded with one or moreapertnressat one-end; thereofthroughwvhich a'coil lead-wirepasses and provid ed also a tapered: mtainingwedge driven into the said: aperturetore-1 tain theleadlwire imposition.

6. A sparke-plug having'a.casing,.an indumtioni-coil in said casing, a. headi closing the end of said! casing; an insulating-plate be+ tween said head? and said coil, a: pain'oftimsulating-sleeves passing through. said! head and into Y said insulatinggplate, A a.- conductingplugini the endof each. ewe-,sparkihgelem trodes secured to said plugs; and insulatedcond'uctors connecting the saidi plugs with p the secondary of said; coil and: assingv through saidslecves andinsulating-p atea.

7. A-spark plughaving aacasing; pnimany and. secondary windingswithimthe casing;. a head having a threaded nipple closing one: end ofthe casing, aninsulating member Withiin the casing" between the windings anidi'the said head and havin openings through; which the lead-wires hem; the secondary; winding pass, a pain ofi insulating sleevrespassing through the saidhead and within the insulating memben, said. sleeveshavin each; 120 a tapered seat in: the-head, a: tapene cone ductinglugholding each of: said sleeves to its seat, and sparking electrodes secured to the end of onerofsaid plugsa I 8; Asparlcplug'having a" casing, primary. v and secondary windings therein, a: head to Which'said'casing is attached: at one-end, said: headbeing provided with. anLattachin -nip.-- ple, insulation between: said; head) an isaid windings, a pair-of insulating-sleeves passing 1 3 throu h said head and extending from said threaded nipple, a conducting-plug in the end of each sleeve, sparking electrodes secured each to the end of one of said plugs, and a pair of secondary lead-wirespassing each from the secondary windings through the said insulation into the inner end of an insulating-sleeve and to the sparking electrode carried therein;

9. A spark-plug having a casing, an induction-coil in said casing, a head closing the end of said casing, a pair of insulatingsleeves passin through said head, sparking electrodes in t e end of said-head, and conductors connecting said electrodes with the secondary of said coil passing through said insulating-sleeves 10. A spark-plug having a casing, ahead provided with a threaded nipple closing the end of said casing, a pair of insulated tapered sleeves passing through the nipple; said sleeves having each a tapered seat therein, a tapered conducting-plug driven into the inner end of each sleeve to hold the same to its ,see

said head being provided with an attachingnipple, insulation between said head and said windings, an insulating-sleeve passing through said head and extending from said threaded nip le, a conducting-plug in the end of said s eeve, a sparking electrode secured tothe end of said plug, and a second- ,ary lead-wire passing from the secondary windings through the said insulation into the inner end of said insulating-sleeve and to. the sparking electrode carried therein.

Witnesses THOMAS B. Boorn,

seat, a removable sparking electrode se- EDITH E. CHAPMAN.

3 In testimony whereof I have signed my 

